senator, roger wicker of mississippi, those letters are suspected to have been tainted, to have been laced with the poison ricin. it can kill. you ricin. the fbi has arrested a man in mississippi in connection with this case. his name, paul kevin curtis, and he also is an elvis presley impersonator of all things. officials across the nation are looking for more suspicious letters even as we speak right now. chris cuomo watching all of this. just outside the cathedral of the holy cross, where the interfaith memorial service will take place, chris. >> all right, thanks, wolf. people lined up since 4:00 in the morning. the name of the service is called healing our city. clear gee from all over boston. political dignitaries here, archbishop sean cardinal o'malley will be here, and the guest of honor, president obama and the first lady. the life of the dead is put into the hearts of the living. this allows people to come together, share in their grief. i'm joined by jessica yellin and john king. this is a message that will have big importance for people here. >> it will here, chris and ar